/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package Controller;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import static java.nio.charset.StandardCharsets.UTF_8;
import java.util.Hashtable;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author bienphongvnn
 */
@WebServlet(name = "TrangChu", urlPatterns = {"/TrangChu"})
public class TrangChu extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            //Nội dung chính của trang Web
            String CONTENT = "";
            StringWriter content = new StringWriter();
            HttpSession session = request.getSession();
            if(request.getParameter("thoat") != null){
                session.removeAttribute("ISLOGIN");
                session.removeAttribute("EMAIL");
            }
            Object ob = session.getAttribute("ISLOGIN");
            Boolean isLogin = true;
            if(ob == null || (Boolean) ob == false){
                isLogin = false;
            }
            if(!isLogin){
                content.append("Bạn chưa đăng nhập!!! ");
                content.append("Vui lòng <a href='DangNhap.jsp'>Đăng nhập</a>");
            }
            else{
                content.append(
                    "<ul>\n"
                    + "<li><a href = 'TintucSukien'>Biển Đông là của Việt Nam: Ngành đường sắt ra sức thi đua bảo vệ chủ quyền biển đảo.</a></li>"
                    + "<li><a href = 'TinhTong'>Học tập tốt là thể hiện tinh thần yêu nước.</a></li>"
                    + "<li><a href = 'DemoServlet'>Demo về sử dụng công nghệ Servlet.</a></li>\n"
                    + "<li><a href = 'LichSuHinhThanh.jsp'>Lịch sử hình thành ngành đường sắt Việt Nam.</a></li>"
                    + "<li><a href = ''></a></li>"
                    + "</ul>");
            }
            content.close();
            CONTENT = content.toString();
            //Xuat noi dung voi template co san
            Hashtable<String, String> data = new Hashtable<String, String>();
            data.put("TITLE", "Tin tức & sự kiện");
            data.put("CONTENT", CONTENT);
            String viewPath = "/View/template.html";
            String absolutepath = getServletContext().getRealPath(viewPath);
            String webcontent = MyUltilities.readFile(absolutepath, UTF_8);
            webcontent = MyUltilities.replace(data, webcontent);
            out.println(webcontent);
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
